"If it is menstrual blood then it is blood that is black and recognizable, so stop praying, and if it is other than that then perform Wudu', for it is just a vein."
Sunan an-Nasa'i Book 1, Hadith 216
← Previous Hadith "Tell her to perform Ghusl and enter Ihram."

Sunan an-Nasa'i Book 1, Hadith 215 Next Hadith → "Menstrual blood is blood that is black and recognizable, so if it is like that, then stop praying, and if it is otherwise, then perform Wudu' and pray." Abu 'Abdur-Rahman said: Others reported this Hadith, and none of them mentioned what Ibn Abi 'Adi mentioned. And Allah Most High, knows best.

Sunan an-Nasa'i Book 1, Hadith 217